I have a Armstrong ultra 80 111 furnace that mane burners will not ignite.
Induction fan comes on pilot lights and stays lite for 90 seconds but mane
burners will not ignite . Thermostat works properly. Blower motor works
when put on fan. Back at the start of winter hade same problem. Removed
door in front of burners and it worked fine until two days ago. Wondering
if it mite be gas valve.

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